One type of graphene tape would be loaded with 95% uranium 235. One type would bring in Polonium. One type would bring in Beryllium. The fourth and final type of graphene tape would be impregnated with pure Copper which is a relatively cheap, fairly heavy, and not very toxic metal. You need lots of heat plus plenty of reaction mass.
The rocket nozzle has to push against something. That stuff should be fairly heavy, not too costly, and not very toxic. My rocket here could be reserved for ignition only in outer space and not inside Earth’s atmosphere.
The graphene tape is very strong. Makes a binding lattice to hold other substances (like my 4 metals, Uranium, Polonium, Beryllium, and Copper).
Ordinary hydrogen/oxygen rockets could be used to convey my rocket to outer space. My rocket runs hot and powerful, and some fission products expelled will be radioactive.
The fission products will be expelled from the nozzle. The slowing down process will depend on flipping the direction of the nozzle in mid-flight. Controlled small burns to adjust yaw, pitch, roll must be done by small ordinary rocket nozzles and water can be used in them as the reaction mass, or any liquid that’s not corrosive or toxic (methanol for example).
Instead of pipes (tubes) bringing fuel to the rocket nozzle, my rocket uses spools of thin tape, or reels if you like. They turn pretty fast.
In lieu of Copper, Tungsten could serve as reaction mass. It has good mass to push against. It is more costly than Copper but just as safe.
The nozzle will be made of manganese and nickel austenitic steel containing some Rhenium, Rhodium, and Molybdenum. I know how to use quenching and tempering to get a very hard, very high heat tolerating nozzle.
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